(1437) Diomedes
This object has a more recent orbit available here
Object
Object | (1437) Diomedes |
Diameter(1) | 118 km |
Dynamic class(1) | trojan |
Absolute magnitude | 8.31 |
G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
Epoch (Julian date) | 2459800.5 |
Semi major axis | 5.214433 ± 0.000000 au |
Eccentricity | 0.045401384 ± 0.000000009 |
Inclination | 20.473586657 ± 0.000000190 ° |
Longitude of ascending node | 315.786316 ± 0.000001 ° |
Argument of perihelia | 128.747213 ± 0.000010 ° |
Mean anomaly | 9.461465 ± 0.000009 ° |
Orbital period | 11.91 yr |
Ephemeris & Observations
Ephemeris version | NIMAv5 |
Observation file |
omc_ast_NIMAv5.txt |
bsp file | 1437_Diomedes_nima_v5.bsp |
Date of first observation | 1931-02-17 |
Date of last observation | 2023-05-15 |
Number of observations used in the fit | 4410 |
Number of rejected observations | 21 |
Number of DES observations | 0 |
Number of MPC observations | 4153 |
Number of unpublished observations | 6 |
RMS of observations | 0.136 arcsec |
Residuals

Residuals in right ascension and declination compared to NIMAv5 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
date | σα (arcsec) | σδ (arcsec) |
2023-01 | 0.010 | 0.005 |
2023-07 | 0.007 | 0.005 |
2024-01 | 0.011 | 0.009 |
2024-07 | 0.009 | 0.007 |
2025-01 | 0.012 | 0.010 |
2025-07 | 0.011 | 0.009 |
2026-01 | 0.014 | 0.008 |
2026-07 | 0.014 | 0.009 |
2027-01 | 0.015 | 0.003 |
Ephemeris comparison

Difference between NIMAv5 and JPL90 in right ascension (weighted by cos δ) and in declination.
Gray area represents the 1-σ uncertainty of NIMA ephemeris. Green dots represent the DES observations.